Dead Lord Screen updated with Radial Cooldown.

Powers can only be placed every few seconds while dead.
Updated Fireball to call the Die function from Controller2D instead of Destroy.
Changed yield variable names. Unchecked the Lords UI from the pre-game lobby.
Merge branch 'master' of https://github.com/RobbSteel/Lords-of-Distortion

Conflicts:
	Lords-of-Distortion/Assets/Scenes/ArenaOne.unity
	Lords-of-Distortion/Assets/Scenes/MainMenu.unity
	Lords-of-Distortion/Assets/Scripts/ArenaManager.cs